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The “Set I/O Unit Scratch Pad Integer 64 Element” command in an action block may cause error -95 in PAC Control
Knowledge Base - KB91609 - Published:
When running a strategy that has the “Set I/O Unit Scratch Pad Integer 64 Element” command in an action block, you may see error -95 (“Data stack is not empty”) in the PAC Control message queue.
SNAP analog modules briefly report out-of-range on all channels 49.71 days after power up or reset
Knowledge Base - KB91588 - Published:
Every 49.71 days after module power-up or reset, all channels briefly return a float value of NaN or counts of -32768, except for SNAP-AIRTD-8U, which returns -2,147,483,648.
PAC Display may incorrectly apply the Comm Failure color to table object graphics
Knowledge Base - KB91566 - Published:
If any tags on the controller have a Comm Failure quality, PAC Display may incorrectly apply the Comm Failure color to a table object graphic when the Enable graphic color change option is enabled in the Runtime setup.
Autorun buttons grayed out on control engine Status dialog box in PAC Control or PAC Terminal
Knowledge Base - KB91567 - Published:
When inspecting a control engine in PAC Terminal or Debug mode in PAC Control, the Autorun buttons in the Inspect dialog box may be grayed out and not clickable if the controller is running SNAP PAC firmware R10.6b and lower.
Append in PAC Control comm handle overwrites an existing file
Knowledge Base - KB91041 - Published:
If your PAC Control strategy uses a communication handle configured to open a file to append data, the existing file is overwritten. (Opening a file to append information is done by specifying a...more
“Loading…” screen does not refresh after restart completes
Knowledge Base - KB91449 - Published:
After a firmware update, you may see a page in your browser that says “Loading EPIC device…” (for EPICs) or “Loading RIO device…” (for RIOs), with the message The...more
NGINX Vulnerabilities in groov EPIC and RIO
Knowledge Base - KB91516 - Published:
There are 4 different vulnerabilities in the NGINX software—which Opto 22 uses for user authentication—that could be exploited (when used in combination) by an unauthenticated attacker to remotely execute code.
PAC Manager firmware update process may fail for devices with poor network connections
Knowledge Base - KB91512 - Published:
When updating firmware on any of the following devices over a high-latency network connection (such as radio modems), the firmware update may fail with an error message in PAC Manager indicating that...more
“Upload Configuration from Opto 22 Device” tool in EtherNet/IP Configurator may result in invalid I/O data
Knowledge Base - KB91437 - Published:
When uploading a configuration using EtherNet/IP Configurator (Tools > Upload Configuration from Opto 22 Device) to a device with existing I/O data, the I/O data may be invalid and cause unpredictable behavior.
Selecting “Pointer Variables” type in PAC Control Configure Variables dialog with subroutine open may unexpectedly change scope to “Global”
Knowledge Base - KB91491 - Published:
When a subroutine is open and active (selected) in PAC Control, and you select Pointer Variables from the Type drop-down list in the Configure Variables dialog (Configure > Variables) in PAC Control...more
Listed items in PAC Control Configure Variables dialog may disappear when a subroutine is open and active
Knowledge Base - KB91487 - Published:
When a subroutine is open and active (selected) in PAC Control, and you select from the Subroutines drop-down menu in the Configure Variables dialog (Configure > Variables), the items listed may disappear.
String table initial value may not update when imported from a .csv file in PAC Control
Knowledge Base - KB91483 - Published:
When importing variables into a strategy from a .csv file in PAC Control, the initial value may not be updated if the initial value in a string table is different from the current initial value.
“Not currently supported” errors for operator-driven PID tag types in PAC Display
Knowledge Base - KB91456 - Published:
When clicking a button with an operator-driven PID tag in PAC Display Runtime, you may encounter an error message about an unsupported tag type. You may also encounter this error in the log file after running Tools > Regenerate IO Scanner Tag Names.
Not all SNAP-IDC5Q points appear in the PAC Control Inspect I/O Unit dialog
Knowledge Base - KB91438 - Published:
When inspecting an I/O unit in PAC Control Debug mode, only the first point of a SNAP-IDC5Q module may appear on the Points [Detailed] and Points [Compact] tabs of the Inspect I/O Unit dialog (double...more
Find & Replace Tag in subroutine replaces substring globally rather than locally
Knowledge Base - KB91408 - Published:
If you are in a subroutine and choose Edit > Replace and then choose Tag in the Search For field in PAC Control, the replacement may not occur locally within the subroutine, as expected. Instead...more

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